Universal sander and polisher



June 7, 1932.

UNIVERSAL SANDER AND POLISHER Filed Dec. 26, 1928 m ni f 12 13 1 15 17 9I 14 J7 15 19 g A TI E3: LL

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Patented June 7, 1932 UNITED STATES AXEL H. 3008, OF CHICO, AND HARRY J.RIDDLE, OF SAN LEANDIRO, CALIFORNIA.

Pm-m OFFICE ASSIGNORS TO A. FREED, TRUSTEE, OF SAN FRANCISCO, CALIFORNIAUNIVERSAL SANDER ,AND POLISHER Application filed December 26, 1928.Serial No. 328,427.

This invention relates to improvements in power operated sandingmachines, our principal object being to provide a machine of thischaracter having a reciprocating sanding pad of such form as to enablesanding operations being carried on as effectively in sharp right angledcorners as on openly exposed surfaces.

A further object of the invention is to construct the implement in sucha manner that it may be readily made in a reat variety of sizes, from aheavy floor san ing machine to one of a hand supported and relativelysmall nature. The implement therefore has a wide 16 range of possibleusefulness and since it may also be used with equal efficiency forpolishing and similar purposes it may be considered an implement adaptedfor universal service in its line.

A further object of the invention is to produce a simple and inex ensivedevice and yet one which will be exceedingly effective for the purposefor which it is designed."

These objects we accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claim.

In the drawing similar characters of reference indicate correspondingparts in the several views:

Fig. 1 is a perspective view of our improved implement as made in asmall hand size.

Fig. 2 is a cross section of the tool.

Fig. 3 is a longitudinal section of the same.

Referring now more particularly to the characters of reference in thedrawing, the tool comprises a rectangular supporting frame plate 1having an upstanding centrally disposed hub 2 providing a support forthe bearings 3 of a spindle 4 whose axis is at right angles to thesurface of the plate. A bevel gear 5 on the upper end of the spindlemeshes with a similar gear 6 mounted in a horizontal tubular housing 7extending radially from the hub and connected thereto by an elbowportion 8 enclosing the gears. A handle member 9 is mounted on one endof a flexible housing 10 to enclose a flexible drive shaft of commoncharacter (not shown), said handle being connected to the outer end ofthe which rides closely between the sides of an oblong slot 14 providedin a slide block 15; said fly-wheel being suitably counterbalanced so asto offset the weight of the eccentric roller and thus reduce vibration.The opposite sides of the block or those which extend in a direction atright angles to the longitudinal plane of the slot 14 are V-grooved asshown at 16 and cooperate with-similarly grooved guide flanges 17depending from the sides of the plate 1 and rigid therewith. Ballbearings 18 ride in the cooperating pairs of grooves so as to supportthe block in fixed relationship to the plate and also allow the same toreciprocate with a minimum of frictional resistance. End plates 19 aresecured to the/ends of the block and extend across the grooves 16 andsnugly fit the grooves of the flanges 17 so as to prevent displacementof the balls and act as scrapers for the latter grooves so as to keepany dust or the like which may settle thereon from coming in contactwith the balls. The slide block is of metal but is cored out so as to bemade as light as possible to reduce the vibration incident toreciprocation to a minimum.

Secured to and depending from this block I is a relatively large pad 20which is of recor the like which is stretched across the bottom of thepad and is passed adjacent its ends between the pad and the teeth of thetwo clips. This pad is preferably made of cork or the like so that whileof relatively 5 large size itis still very light and thus reducesvibration incident to reciprocation to x a minimum. This material alsoprovides a means for yieldable engagement with the jaw teeth, which aidsin preventing possible slipping of the work sheet held against the pad.

In operation the pad is constantly reciprocated at a relatively hi hspeed by the driving mechanism herein efore described, While the tool asa whole is guided in its- 16 movement and the necessary pressure exertedagainst the work sheet by the hand of the operator engaged with thehandle 9. The length of the frame 1 and its guide flanges are soproportioned to the stroke of the ec- 20 centric roller and slide blockthat the latter never projects from one end or the other of said guideflanges and ball-bearings are thus never exposed.

This device can also be made in miniature sizes to be used formanicuring purposes, such as nail filing and polishing, since the backand forth movement of the working block simulates the natural rubbingmovement of the human hand in carrying out such operations. Thismovement is also advantageous in the larger sizes of the device, sinceit avoids the rings and other marks commonly made by the rotary machinesnow used. From the foregoing description it will be 86 readily seen thatwe have produced such. a device as substantially fulfills the objects ofthe invention as set forth herein.

While this specification sets forth in de-. tail the present andpreferred construction 40 of the device, still in practice suchdeviations from such detail may be resorted to as do not form adeparture from the spirit of the invention, as defined by the appendedclaim.

Having thus described my invention what we claim as new and useful anddesire to secure by Letters Patent is: A rubbing implement comprising asupporting plate having depending side flanges I grooved along theirinner faces, a slide block 60 movable between the flanges and havingside rooves matching with the grooves in the flanges, anti-frictionbearings in the matching grooves, plates secured to the ends of theslide block and projecting beyond the edges thereof into a running fitin the grooves of the flanges to act as retainers'for the bearingstherein and as scrapers for the side walls of such grooves, and arubbing element on the face of the block. In testimony whereof we aflixour signatures.

AXEL H. ROOS. HARRY J. RIDDLE.

